Pulp-reducing apparatus.



C. W. SHARTLE.

PULP REDUCING APPARATUS.

APPLICATION man Nov. 25. 1912.

1,173,747. Y Peteneed Feb. 29,1916. Q

2 SHEETS-SHEETA l.

c. w. SHARTLE.

PULP REDUCING APPARATUS.

APPLICATION min Nov. 25, 1912.

1,173,747. Patented Feb.29,1916.

2 SHEETS-SHEET 2- u), S a?, M. GB/hm), L, 2 Attorney CHARLES WELLS SHARTLE, 0F MIDDLET'OWN, OHIO.

PULP-REDUCING APPARATUS.

Specification of Letters Patent.

Patented Feb. 29, 1916.

lapplication led November 25, 1912. Serial No. 733,267.

To all whom t may concern Be it known that I, CHARLES WELLS SHARTLE, a citizen of the United States, re-

siding at Middletown, Butler county, Ohio, have invented certaininew-v and useful Improvements in Pulp-Reducing Apparatus, of which the following is a specification.

This invention'relates to a process of and apparatus for reducing pulp, such as is commonly employed in the manufacture of paper.

The object of the invention is to provide a process for continuously reducing the stock or pulp to the required degree of fine-v ness, the .fine pulp being automatically separated from the coarse without interrupting the continuous treatment of the coarser pulp; and further, provide an apparatus for carrying out this continuous operation.

Reference may be proiitably made to United States Patents Nos. 989,879 of 1911 and 1,011,255 of vDecember 12, 1911 relating to pulp-reducing apparatus invented b me.

yrEhe present invention after reference to the above mentioned patents may be readily understood from the following description taken in connection with the accompanylng drawings in which Figure 1 is a plan of a pulp-reducing apparatus exemplifying an embodiment of my invention; Fig. 2, a side elevation of the same, both ofthese figures being of a somewhat diagrammatic character; Fig. 3, a Vertical section through the outlet` of a beatertub inthe plane of 'lines a of Fig. l; and Fig. et, a vertical section of thewhirl-pool in the plane of line b of Fig. 1.

in carrying out my process I place the stock which v1s to be reduced in a suitable receptacle or tub, with large quantities of,

water, and treat the same to reduce it to a pulp of the desired degree of neness. As will be readily understood, parts of the material will soften and be reduced to the desired ineness more quickly than will other parts of the material, this being particularly true where the stock being worked is old paper stock. As the treatment continues and the JIportions of pulp reach the desired degree o neness, l cause the water to overiiow from the tub and to carry with it such portions ofthe stock in suspension therein as may be of suiiicient fineness. |This stock which overflows from the tub is then screened or treated to further separate the fine pulp from the coarse pulp, and the coarser portions of this pulp, or tailings, are returned tothe tub for further treatment. This process is carried on continuously and without interruption, additional stock and water being added to the tub from time to time to replace those portions thereof which overflow from the tub.

I n the 'accompanying drawings l have illustrated an apparatus for carrying out this process, and this lapparatus is also capable of carrying out an amplified process embodying the same steps above described, and other steps. This amplified process consists inl first treating the stock to reduce it to pulp, causing the properly reduced pulp to overflow, then subjecting the pulp which has thus overflowed to the action of a digester, then screening the pulp after it leaves the digester and again treating the tailings from the screen to further reduce the same, causing the properly reduced pul to again overflow and to be again screene These drawings illustrate one apparatus by means of which the process may be carried out, but is shown here merely for the purpose of illustration, it being understood that various apparatuses may be utilized in carrying out the invention.

1, indicates a breaking engine, of construction similar to a beating engine except that its cylinder is not set close to the bed-plate, the function of this breaking engine being to break up masses of stock such as books, bundles of paper, etc., and reduce the stock to such condition that it may be pumped -through pipes; 2, the water-supply pipe for the breaking engine; 3, a low point in the rim of the tub of the breaking engine to form an outlet for broken stock therefrom; 4, a receiver or conduit to receive the outflow from the breaking engine; A5, a pump receiving the stock from conduit 4; 6, a digester, illustrated as of rotary type; 6, the discharge pipe from pump 5, the same delivering into the digester; 6, a steam pipe communicating with the digester to deliver steam thereto; 7, a trough forming asetlbling-box; 8, a pipe connected with the dgester and delivering to the initial end of the screen-plates; 10, a whirl-pool, the same consisting of a circular vessel into which trough 7 delivers tangentially at a polnt above the iioor of the vessel; 11, a fender disposed across the upper portion of the ves- Isel of the whirl-pool and presenting an upper face sloping downwardly toward the side of the vessel into whichtrough 7 delivers; 12, a trough leading from the u per portion of the whirl-pool to the head o the screen, the connection of this trough with the whirl-pool vessel being on that side of :tender 11 opposite the inlet to the vessel from trough 7; 13, 4a beating engine; 14, the outlet from the tail of the screen into the beating engine; 15, a water-supply pipe to the beating engine; 16, a low point in the r11 n of the tub of the beating engine to permit of the outfiow of the beaten stock therefrom; 17, a receiver or conduit to receive the outiow from the beating engine; 18, a pump to receive the pulp going from the beating engine; 19, the discharge pipe of this pump, the same delivering into the initial end of settling-box 7; 20, a wet machine, comprising a vat and a foraminous cylinder rotating therein; 21, a conduit to convey to the vat of the wet machine the fine pulp and water which passes through the plates of the screen; 22, the foraminous cylinder of the wet machine; 22a, the couch-roll of the wet machine; 23 the doctor for t-he couchroll; 24, the nished-pulp vat of the Wet machine, the same containing an agitator to keep the pulp in fair condition for outow; 25, the outflow pipe for the nished pulp leaving the wet machine; 26, a pump r'eceiving the water and entrained pulp which has passed into the cylinder of the Wet ma` chine; and 27, the discharge pipe of pump 26, the same delivering to trough 7, or elsewhere as desired.

Such paper making stock as old papers and books, is generally in compact bundles and along with this will be mixed much hard material such as iron and glass, and also some very light material, such as .cork and wood, which foreign matters should be kept out of the pulp and out of the beating enginewhich reduces the stock to ulp.

I have found in practice that 1f stock is circulating in a breaking or beating engine in the presence of large quantities of water,

the finest stui1 is at the to while swimming in and upon the top of this finer stud is the coarser stud such, for instance, as unbroken bundles and books in the breaking engine.u The finer stock may overow from the breaking engine while the coarser or unbroken stock continues to swim along in the circuit.

The stock having been placed in the breaking engine 1 and supplied with large quantities of water the engine breaks up the stock and the tub of the breaking engine being carried suhciently full to permit overflow, the finer stock overflows through low point 3 in the rim of the tub and goes to the conduit or receiver 4 which ldelivers it to some part of the apparatus for further treatment. Where the arrangement of the apparatus issuch that some part thereof which acts on the stock after it leaves the tub is elevated above the, level of the tub, as shown in the present drawings, an elevating device, such as a pump 5, is provided and the receiver delivers the stock to this elevating device. The unbroken masses do not overiow with the tine stu but continue along in the circuit. Water and stock are to be added to the breaking engine as fast as required to makeup for the outflow from the tub. This additional water and stock may be fresh water and fresh stock or it may consist partially'or entirely of water and stock which have passed through some part of the apparatus. In the apparatus here illustrated fresh Water and stock are added to the breaking engine while the beating engine receives tailings from thevscreen, as will be hereinafter explained.'

The broken stuf from the breaking engine is delivered to the digester by pump 5 and is therein subjected to the action of steam supplied through pipe 6b; The digester is illustrated as of rotary type but it may be of any desired character adapted to have broken stuff pass through it in the presence of steam. The stufi' in passing through the digester has its fibers opened up and separated and upon leaving the digestel it goes through pipe 8 to settlingbox on its way to the whirl-pool. In passing through the settling-box it deposits therein such heavy impurities as may settle to the bottom of the settling-box but the light fioating impurities and also some of the heavy impurities will be carried to the whirl-pool. The stock entering the whirlpool rotates therein in finding its way to the outlet to the screen. The heavy matters which have succeeded in reaching the whirl-pool will settle therein, While the eX- tra light impurities will be skimmed and arrested by fender 11, the result being that stock going rto the screen is practically free from both heavy and light impurities. The heavy impurities settling in the settlingbox and Whirl-pool, and the light impurities arrested in the whirl-pool may be cleared awav from time to time as occasion requires.l The stock goes from the whirlpool tothe screen, and such matter as does not pass through the screen-plates goes from the tail of the screen to beating engine 13 whose action is to pulp the stock. The

overflows the tub and goes to pump 18 from which it finds its way again to the screen, the sufficiently fine pulp passing through the screen-plates, and the coarser pulp passing as before from the tail of the screen to the beating engine, the coarsest stock in the beating engine swimming around in the tub. The result is that the stock passes over the screen; there is abstracted from it pulp of sufficient fineness to pass through the screen; the tailings of the screen are again subjected to beating action; the finer products'from the beating engine go again to the screen, and so 0n and on and on, the stock coming from the digester to make up for the pulp which has passed through the screen-plates, the operation being continuous.

It will be noted that the overfiow of the pulp from both the breaking engine and the beating engine is due solely to the increase of the quantity of stock and water in the tubs, and that no pumping or forcing action of any kind is required. Consequently, I employ open tubs, as distinguished from the casings of' those reducing engincs in which the reducing ele'ment also has a pumping or forcing action which causes the pulp to be discharged from the casin PuIp and water which has passed through the screen-plates finds its way through conduit 21 and its connections to the wet machine, where it is picked up bv the foraminous cylinder, the water with some entrained pulppassing into the cylinder, while the drier finished pulp is scraped ofi' of the cylinder by the doctor and goes through pipe 25 to any proper point for use or for further treatment. The water and entrained` pulp which has passed into the cylinder of the wet machine is taken by pump 26 and is delivered again into the general circuit so that the entrained pulp may be recovered. The water and entrained pulp handled by pump 26 may be so dirty that it is undesirable to let it go back into the circuit to go into the finished pulp and in such case pipe 27, instead of delivering into the circuit may deliver to some point of waste or to some point of utilization of the material where dirtiness is not of special moment.

I claim 1. A pulp reducing apparatus comprising a reducing engine adapted to reduce'the coarseness of the material under treatment and comprising an open tub arranged to `permit the material to overfiow from it as of the material under treatment and comprising an open tub arranged to permit the material to overliow from it as additional material lis deposited therein, a screen, a receiver to receive the overfiow from the tub, and means for delivering the material from said receiver to said screen.

In a pulp reducing apparatus, a reducing engine comprising an open tub arranged to cause portions of the material under treatment therein to overflow, a screen arranged to deliver its tailings to said reducing engine, and means for transferring the pulp which has overflowed to said screen.

4. In a pulp reducing apparatus, a reducing engine comprisin an open tub arranged to permit the stu therein to overfiow, a screen arranged todeliver its tailings to said beating engine and conveying mechanism, comprising a pump for transferring the stuff which has overfiowed from said engine to said screen.

5. In a pulp reducing apparatus, a breaks ing engine comprising an open tub arranged to cause the stuff therein to overfiow, a beating engine also arranged to cause the stu' to overfiow, a screen arranged to deliver its tailings to said beating engine, means to transfer the stuli" which has overfiowed from said breaking engine to said screen, and other means for transferring the stufll which has overflowed'from said beatin engine to said screen, whereby said stul 1s continuously and automatically acted upon to cause it to be reduced to the proper fneness and the fine pulp to be separated from the coarse.

6. In a pulp reducing apparatus, a breaking engine comprising an open tub arranged to cause the stu therein to overflow, a beating engine also comprising an open tub arranged to cause thestuf therein to overliow, a screen, a settling box to deliver to said screen, and means to transfer the material which has overfiowed 'from said breaking engine and said beating engine to said settling box.

7. In a pulp-reducing apparatus, a reducing engine comprising an open tub ar- -ranged to permit portions of the material therein to overflow, a receiver arranged to receive the material overiowin vfrom said tub, a screen, and means to dellver the material from said receiver to saidscreen, said means comprising a pump communicating with said receive y,

8. In a pulp reducing apparatus, a reducing engine arranged to cause the stufi` therein to overiow, a screen arranged to deliver its tailings to said reducing engine, a

settling box to deliver to said screen, and means to transfer the material, which has overfiowed from said reducing engine, to said settling box.

9. In a pulp reducing apparatus, a breaking engine arranged to cause the stu therein to overflow, a reducing engine also arranged to cause the stu therein to overflow, a screen arranged to deliver its tailings to said reducing engine, a settling box to deliver to said screen, and means to transfer the material which has overowed from said breaking engine and said beating engine te said settling box.

CHARLES WELLS SHARTLE.

Witnesses ELSE KAFFENBERGER, GERTRUDE BRIDGE. 

